Multi-User Jingle. Sjoerd Simons LCA Collabora Ltd, sponsored by NlNet
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1 Multi-User Jingle Sjoerd Simons Collabora Ltd, sponsored by NlNet LCA 2009
2 Multi-User Jingle XMPP protocol extension for initiating and managing multiparty voice and video conferences within an XMPP MUC using Jingle
3 Jingle XMPP protocol extension for initiating and managing peer-to-peer media sessions between two XMPP entities
4 XMPP Extensible Messaging and Presence Protocol The protocol formaly known as Jabber XML streams XMPP Core: RFC 3920 XMPP IM: RFC 3921 Extensions using XMPP Extension Proposals (XEP)
5 XMPP JID Almost but not entirely unlike an address:
6 Messages <message to= net from= j u l i e e x a m p l e. com/ b a l c o n y type= chat xml:lang= en > <body>wherefore a r t thou, Romeo?</ body> </ message>
7 Presence <p r e s e n c e from= romeo@montague. l i t / o r c h a r d > <show>dnd</ show> <s t a t u s>wooing J u l i e t</ s t a t u s> <c xmlns= h t t p : // j a b b e r. org / p r o t o c o l / caps hash= sha 1 node= h t t p : // t e l e p a t h y. f r e e d e s k t o p. org / w i k i / Muji v e r= iunyhdsoy4nydvpdhotqcfubsz8= /> </ p r e s e n c e>
8 Info/Query <i q xmlns= j a b b e r : c l i e n t to= juliet@ example. com/ balcony from= romeo@example. net / orchard id= t y p e= g e t > <q u e r y xmlns= h t t p : // j a b b e r. org / p r o t o c o l / d i s c o#i n f o node= h t t p : // t e l e p a t h y. f r e e d e s k t o p. org / w i k i / Muji#iuNYhdSOy4nYDVPDhoTqCFubSz8= /> </ i q> <i q xmlns= j a b b e r : c l i e n t to= romeo@example. net / orchard from= juliet@ example. com/ balcony id= t y p e= r e s u l t > <q u e r y xmlns= h t t p : // j a b b e r. org / p r o t o c o l / d i s c o#i n f o > <i d e n t i t y c a t e g o r y= c l i e n t t y p e= pc name= Telepathy Gabble /> <f e a t u r e v a r= u r n : x m p p : j i n g l e : 0 /> <f e a t u r e v a r= u r n : x m p p : j i n g l e : a p p s : r t p : 0 /> <f e a t u r e v a r= u r n : x m p p : j i n g l e : t r a n s p o r t s : r a w udp:0 /> </ q u e r y> </ i q>
9 Jingle XMPP protocol extension for initiating and managing peer-to-peer media sessions between two XMPP entities XEP-0166: Jingle XEP-0167: Jingle RTP Sessions XEP-0176: Jingle ICE-UDP Transport Method XEP-0177: Jingle Raw UDP Transport Method
10 Jingle session initiation <iq from= l i t / orchard i d= j i n g l e 1 to= j u l i e c a p u l e t. l i t / b a l c o n y type= set > <j i n g l e xmlns= u r n : x m p p : j i n g l e : 0 a c t i o n= s e s s i o n i n i t i a t e i n i t i a t o r = romeo@montague. l i t / o r c h a r d s i d= a 7 3 s j j v k l a 3 7 j f e a > <c o n t e n t c r e a t o r= i n i t i a t o r name= v o i c e > <d e s c r i p t i o n xmlns= u r n : x m p p : j i n g l e : a p p s : r t p : 1 media= a u d i o > <payload t y p e i d= 96 name= s p e e x c l o c k r a t e= /> <payload t y p e i d= 97 name= s p e e x c l o c k r a t e= 8000 /> </ d e s c r i p t i o n> <t r a n s p o r t xmlns= u r n : x m p p : j i n g l e : t r a n s p o r t s : i c e udp:0 /> </ c o n t e n t> <c o n t e n t c r e a t o r= i n i t i a t o r name= v i d e o > <d e s c r i p t i o n xmlns= u r n : x m p p : j i n g l e : a p p s : r t p : 1 media= v i d e o > <payload t y p e i d= 98 name= THEORA c l o c k r a t e= > <parameter name= h e i g h t value= 600 /> <parameter name= width value= 800 /> <p a r a m e t e r name= d e l i v e r y method v a l u e= i n l i n e /> <p a r a m e t e r name= c o n f i g u r a t i o n v a l u e= s o m e b a s e 1 6 s t r i n g /> </ payload t y p e> </ d e s c r i p t i o n> <t r a n s p o r t xmlns= u r n : x m p p : j i n g l e : t r a n s p o r t s : i c e udp:0 /> </ c o n t e n t> </ j i n g l e> </ i q>
11 Jingle session initiation <c o n t e n t c r e a t o r= i n i t i a t o r name= v i d e o > <d e s c r i p t i o n xmlns= u r n : x m p p : j i n g l e : a p p s : r t p : 1 media= v i d e o > <payload type i d= 98 name= THEORA c l o c k r a t e= > <parameter name= h e i g h t v a l u e= 600 /> <parameter name= width v a l u e= 800 /> <parameter name= d e l i v e r y method v a l u e= i n l i n e /> <parameter name= c o n f i g u r a t i o n v a l u e= s o m e b a s e 1 6 s t r i n g /> </ payload type> </ d e s c r i p t i o n> <t r a n s p o r t xmlns= u r n : x m p p : j i n g l e : t r a n s p o r t s : i c e udp:0 /> </ c o n t e n t>
12 Transport information <iq from= l i t / orchard i d= i n f o 1 to= j u l i e c a p u l e t. l i t / b a l c o n y type= set > <j i n g l e xmlns= u r n : x m p p : j i n g l e : 0 a c t i o n= t r a n s p o r t i n f o i n i t i a t o r = romeo@montague. l i t / o r c h a r d s i d= a 7 3 s j j v k l a 3 7 j f e a > <c o n t e n t c r e a t o r= i n i t i a t o r name= v o i c e > <t r a n s p o r t xmlns= u r n : x m p p : j i n g l e : t r a n s p o r t s : i c e udp:0 pwd= asd88fgpdd777uzjyhagzg ufrag= 8hhy > <c a n d i d a t e component= 1 f o u n d a t i o n= 1 g e n e r a t i o n= 0 i p= network= 1 port= 8998 p r i o r i t y= p r o t o c o l= udp type= host /> </ t r a n s p o r t> </ c o n t e n t> </ j i n g l e> </ i q>
13 Accepting a Jingle session <i q from= j u l i e c a p u l e t. l i t / b a l c o n y i d= a c c e p t 1 to= romeo@montague. l i t / orchard type= set > <j i n g l e xmlns= u r n : x m p p : j i n g l e : 0 action= session accept i n i t i a t o r = romeo@montague. l i t / o r c h a r d r e s p o n d e r= j u l i e c a p u l e t. l i t / b a l c o n y s i d= a 7 3 s j j v k l a 3 7 j f e a > <c o n t e n t c r e a t o r= i n i t i a t o r name= v o i c e > <d e s c r i p t i o n xmlns= u r n : x m p p : j i n g l e : a p p s : r t p : 1 media= v o i c e > <payload t y p e i d= 96 name= s p e e x c l o c k r a t e= /> <payload t y p e i d= 97 name= s p e e x c l o c k r a t e= 8000 /> </ d e s c r i p t i o n> <t r a n s p o r t xmlns= u r n : x m p p : j i n g l e : t r a n s p o r t s : i c e udp:0 > </ t r a n s p o r t> </ c o n t e n t> <c o n t e n t c r e a t o r= i n i t i a t o r name= v i d e o > <d e s c r i p t i o n xmlns= u r n : x m p p : j i n g l e : a p p s : r t p : 1 media= v i d e o > <payload t y p e i d= 98 name= t h e o r a c l o c k r a t e= > <parameter name= h e i g h t value= 600 /> <parameter name= width value= 800 /> <p a r a m e t e r name= d e l i v e r y method v a l u e= i n l i n e /> <p a r a m e t e r name= c o n f i g u r a t i o n v a l u e= s o m e b a s e 1 6 s t r i n g /> <parameter name= sampling value= YCbCr 4: 2 : 2 /> </ payload t y p e> </ d e s c r i p t i o n> <t r a n s p o r t xmlns= u r n : x m p p : j i n g l e : t r a n s p o r t s : i c e udp:0 /> </ c o n t e n t> </ j i n g l e> </ i q>
14 Multi User Chat MUC: XEP-0045 Widely deployed Messages in the muc are ordered!
15 Joining a muc <p r e s e n c e from= hag66@shakespeare. l i t /pda to= darkcave@chat. s h a k e s p e a r e. l i t / t h i r d w i t c h /> The MUC responds with presences of all current MUC members, with our own presence as the last.
16 Multi-User Jingle and MUC The MUC server shouldn t need to provide any infrastructure for Multi-User Jingle Shouldn t interfere with clients not supporting Multi-User Jingle Shouldn t depend on the one leader
17 Multi-User Jingle Each client announces the streams it s interested in and it s payload mapping in its presence Each clients does its own payload mapping calculation when joining based on the information from existing clients Each clients sets up a Jingle session to all existing clients Joining the Multi-User Jingle session split in in two stages to prevent race conditions.
18 Joining step 1 Announce that you re preparing to start or join the session: <p r e s e n c e xmlns= j a b b e r : c l i e n t to= test0@ night. luon. net / from= m u j c o n f e r e n c e. n i g h t. l u o n. n e t / t e s t 0 > <c xmlns= h t t p : // j a b b e r. org / p r o t o c o l / caps node= h t t p : // t e l e p a t h y. f r e e d e s k t o p. org / w i k i / Mingle hash= sha 1 v e r= 9KlXkd+F+C/WPRXVRn77ai5k4qI= /> <muji xmlns= h t t p : // t e l e p a t h y. f r e e d e s k t o p. org / muji > <content name= video preparing= true /> <content name= audio preparing= true /> </ muji> <x xmlns= h t t p : // j a b b e r. org / p r o t o c o l /muc#u s e r > <item a f f i l i a t i o n = owner j i d= test0@ night. luon. net / r o l e= moderator /> </ x> </ p r e s e n c e>
19 Joining step 2 After all clients that announced they were preparing to join have done so, update your presence with your payload mapping: <p r e s e n c e xmlns= j a b b e r : c l i e n t to= test0@ night. luon. net / from= m u j c o n f e r e n c e. n i g h t. l u o n. n e t / t e s t 0 > <c xmlns= h t t p : // j a b b e r. org / p r o t o c o l / caps node= h t t p : // t e l e p a t h y. f r e e d e s k t o p. org / w i k i / Muji hash= sha 1 v e r= 9KlXkd+F+C/WPRXVRn77ai5k4qI= /> <muji xmlns= h t t p : // t e l e p a t h y. f r e e d e s k t o p. org / muji > <content name= audio > <d e s c r i p t i o n xmlns= u r n : x m p p : j i n g l e : a p p s : r t p : 0 media= audio > <payload t y p e i d= 96 name= s p e e x c l o c k r a t e= /> <payload t y p e i d= 97 name= s p e e x c l o c k r a t e= 8000 /> </ d e s c r i p t i o n> </ c o n t e n t> <content name= video > <d e s c r i p t i o n xmlns= u r n : x m p p : j i n g l e : a p p s : r t p : 0 media= video > <payload type id= 96 name= THEORA c l o c k r a t e= > <p a r a m e t e r name= d e l i v e r y method v a l u e= i n l i n e /> <p a r a m e t e r name= c o n f i g u r a t i o n v a l u e= s o m e b a s e 1 6 v a l u e /> </ payload t y p e> </ d e s c r i p t i o n> </ c o n t e n t> </ muji> <x xmlns= h t t p : // j a b b e r. org / p r o t o c o l /muc#u s e r > <item a f f i l i a t i o n = owner j i d= t e s t n i g h t. l u o n. n e t / r o l e= moderator /> </ x> </ p r e s e n c e>
20 Demo! Python client to make it easy to play with the protocol Farsight2 for the RTP streaming libnice (through farsight) for the ICE transport
21 Multi-User Jingle Advantages: Only needs basic infrastructure Each client can decide how to present the conference Disadvantages: Does not scale to large groups
22 Scaling Multi-User jingle Scaling without extra infrastructure is limited by: Amount of streams a client can decode Amount of upstream bandwidth Amount of downstream bandwidth
23 RTP relay Clients send their streams to the relay, which relays it to (all) others Advantage: Removes the limitation on the clients upstream bandwidth Disadvantages: Adds some latency especially when the relay is badly choosen
24 Mixer Clients their streams to the mixer, which combines (mixes them) in some way and send them to others. Advantages: Removes the limitation on the amount of streams can be decoded by the client Removes the limitation on the clients downstream bandwidth Removes the limitation on the clients upstream bandwidth
25 Mixer Disadvantages: The mixer needs to reencode and mix the data CPU intensive (transcoding) Lowers the quality Clients don t have control over the presentation anymore.
26 Combined relay and mixer Let clients choose whether they want to receive a mixed stream or not. Advantages: Removes the limitation on clients upstream bandwidth. Allows clients to decide about the trade-off between downstream bandwidth and having higher quality/control over the presentation
27 Codecs Each client only encodecs the media once. Which means the conference ends up using the lowest common denominator Not such a big issue for audio Scalable video codecs might be a solution Have a low resolution, low quality base layer.. On which extra layers are added to improve quality Decide per client which layers to send H264/SVC exists, but is heavily patented No free scalable video available :(
28 Links Project wiki: http: //telepathy.freedesktop.org/wiki/multiuserjingle NlNet site: Farsight2: libnice:
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